CN108913965B - ZnAlTiSiB anticorrosive coating for steel structure and preparation method thereof - Google Patents
ZnAlTiSiB anticorrosive coating for steel structure and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C18/00—Alloys based on zinc
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/003—Alloys based on aluminium containing at least 2.6% of one or more of the elements: tin, lead, antimony, bismuth, cadmium, and titanium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
- C22C30/06—Alloys containing less than 50% by weight of each constituent containing zinc
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/131—Wire arc spraying
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- Metallurgy (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Coating By Spraying Or Casting (AREA)
- Prevention Of Electric Corrosion (AREA)
Abstract
The invention discloses a ZnAlTiSiB anticorrosive coating for a steel structure, which comprises the following components in percentage by mass: 42.8 to 75 percent of Zn, 15 to 55 percent of Al, 0.5 to 5 percent of Ti, 0.7 to 3 percent of Si and 1 to 2 percent of B. According to the ZnAlTiSiB anticorrosive coating, corrosion products formed by Ti, Si and B are insoluble in water, so that the corrosion rate of the coating is reduced, the coating is completely compact, and the corrosion resistance life of a steel structure is prolonged. The invention also discloses a method for preparing the ZnAlTiSiB anticorrosive coating for the steel structure, which comprises the following steps: firstly, pretreating the surface of a steel structure to be more than Sa2.5 grade; and secondly, spraying the spraying material on the surface of the pretreated steel structure by adopting an electric arc spraying method to form the ZnAlTiSiB anticorrosive coating. The method reduces the pores in the coating and improves the bonding strength between the coating and the steel structure.
Description
Technical Field
The invention belongs to the technical field of steel structure corrosion prevention, and particularly relates to a ZnAlTiSiB anticorrosive coating for a steel structure and a preparation method thereof.
Background
Zn has the advantage of electrochemical activity, can provide effective cathodic protection for a steel matrix, and has the isolation and protection effects of blocking corrosive media, but the corrosion rate of a Zn coating is higher and the coating is consumed more quickly due to the fact that corrosion products of Zn are dissolved in water. The Al coating is easy to form compact Al in the atmosphere2O3The film has good passivation protection effect, and the corrosion product is insoluble in water, so that the corrosion speed is greatly reduced. Therefore, ZnAl alloy is the most commonly used steel structure anticorrosion coating material.
The alloy coating prepared by adopting the electric arc spraying method avoids the pollution of hot dipping, is suitable for preparing the anticorrosive coating of the large-scale steel structure and is convenient for field construction. In the production, the ZnAl alloy coating is prepared by an electric arc spraying method to improve the corrosion resistance of the steel structure. However, even though the ZnAl alloy coating prepared by the ultra-high-speed electric arc spraying method still has more than 2 percent of pores and even up to 20 percent of pores, corrosive media are easy to permeate into the coating and a steel structure matrix from the pores, the consumption of Zn is accelerated, the coating is damaged, and the corrosion resistance is lost. In the invention patent with publication number CN1141414C, organic coatings such as chlorinated rubber coating, epoxy resin paint coating or high-chlorine polyethylene coating are used to seal the pores of the thermal-sprayed zinc-aluminum alloy coating, thereby improving the corrosion-resistant life. But the spraying of the organic seal coating causes the cost of the material and the process of the anti-corrosion coating to be obviously increased, and is not suitable for popularization and application. Therefore, the development of an anticorrosive coating with strong anticorrosive ability and low cost for the corrosion prevention of steel structures is urgently needed.
Disclosure of Invention
The invention aims to solve the technical problem of providing a ZnAlTiSiB anticorrosive coating for a steel structure aiming at the defects of the prior art. The corrosion products formed by Ti, Si and B in the ZnAlTiSiB anticorrosive coating are compact in structure and insoluble in water, the corrosion rate of the coating is reduced, micro pores in the coating are blocked, the coating is completely compact, the ZnAlTiSiB anticorrosive coating has the effects of cathode protection and shielding protection, and the corrosion resistance life of a steel structure is prolonged.
In order to solve the technical problems, the invention adopts the technical scheme that: the ZnAlTiSiB anticorrosive coating for the steel structure is characterized by comprising the following components in percentage by mass: 42.8 to 75 percent of Zn, 15 to 55 percent of Al, 0.5 to 5 percent of Ti, 0.7 to 3 percent of Si and 1 to 2 percent of B.
In addition, the invention also provides a preparation method of the ZnAlTiSiB anticorrosive coating for the steel structure, which is characterized by comprising the following steps:
step one, adopting a sand blasting method or a high-pressure water sand blasting method to pretreat the surface of a steel structure to be more than Sa2.5 grade;
heating the spraying material to a molten state by adopting an electric arc spraying method, and spraying the spraying material on the surface of the pretreated steel structure under the action of compressed air to form a ZnAlTiSiB anticorrosive coating; the spraying material is a ZnAlTiSiB wire material, or a Zn wire and an AlTiSiB wire material, or a ZnAlTiSiB powder core wire material.
The method is characterized in that the ZnAlTiSiB powder core wire in the step two is composed of Zn wires and Al wire coated TiSiB powder, or is composed of ZnAl wire coated AlTiSiB powder.
The method is characterized in that in the second step, the distance between a spray gun adopted by the electric arc spraying method and the surface of the steel structure is 100-280 mm, the spraying angle of the spray gun is 60-90 degrees, the electric arc voltage is 20-40V, the electric arc current is 200-600A, the conveying speed of the spraying material is 0.5-5 m/min, and the pressure of the compressed air is 0.4-0.9 MPa.
Compared with the prior art, the invention has the following advantages:
1. according to the ZnAlTiSiB anticorrosive coating, Ti, Si and B are added into common Zn and Al anticorrosive coating elements as densification elements, corrosion products formed by the Ti, the Si and the B are compact in structure and insoluble in water, the corrosion rate of the coating is reduced, micro pores in the coating are blocked, the coating is completely compact, and the shielding protection function is realized on a steel structure, so that the ZnAlTiSiB anticorrosive coating has the functions of cathode protection and shielding protection at the same time, and the corrosion life of the steel structure is prolonged to more than 50 years.
2. The Ti, Si and B in the ZnAlTiSiB anticorrosive coating improve the compactness of the coating, further enhance the isolation and protection effect of the coating on external corrosive media, reduce the coating consumption caused by the dissolution of corrosion products formed by Zn in the coating in water, strengthen the cathode protection effect of Zn on a steel structure and further prolong the corrosion resistance life of the steel structure.
3. The ZnAlTiSiB anticorrosive coating is prepared by adopting an electric arc spraying method, because Ti in a spraying material of the ZnAlTiSiB anticorrosive coating can absorb oxygen in compressed air, the coating material is atomized under the action of the compressed air to form high-speed metal particle flow without an oxide film on the surface, and then the high-speed metal particle flow collides and deposits on the surface of a steel structure to form the coating, so that tight metal bond combination is formed inside the coating, the pores in the coating are reduced, the density of the finally prepared ZnAlTiSiB anticorrosive coating reaches over 99.8 percent, and the microhardness reaches 42HV0.5The above.
4. The ZnAlTiSiB anticorrosive coating is prepared by adopting an electric arc spraying method, so that intermetallic mechanical bonding is formed between the coating and a steel structure, and meanwhile, Si and B in a spraying material of the ZnAlTiSiB anticorrosive coating improve the temperature and the speed of atomized metal particles, so that the atomized metal particles collide with the surface of the steel structure to cause diffusion, metallurgical bonding is achieved, the bonding strength between the coating and the steel structure is greatly improved under the combined action of the mechanical bonding and the metallurgical bonding, and the bonding strength between the coating and the steel structure is larger than 30 MPa.
5. The ZnAlTiSiB anticorrosive coating is prepared by adopting an electric arc spraying method, and because the metallurgical bonding between the coating and the steel structure is tight, the steel structure is only required to be subjected to simple sand blasting pretreatment, so that the pickling pretreatment process of the steel structure is avoided, the environment is not polluted, and the method is safe and environment-friendly.
6. The invention adopts the electric arc spraying method to prepare the ZnAlTiSiB anticorrosive coating spraying material which not only can adopt ZnAlTiSiB wires, Zn wires and AlTiSiB wires, but also can adopt ZnAlTiSiB powder core wires, has wide source range and convenient use.
7. The invention adopts the ZnAlTiSiB cored wire as the spraying material for preparing the ZnAlTiSiB anticorrosive coating by the electric arc spraying method, can adjust the component content of the ZnAlTiSiB anticorrosive coating by adjusting the composition of the outer wire and the inner core powder in the ZnAlTiSiB cored wire according to the anticorrosive requirement of an actual steel structure, is flexible and convenient, and the AlMgTiSiB powder and the outer metal react firstly during spraying, thereby being beneficial to forming a uniform coating structure and improving the quality of the ZnAlTiSiB anticorrosive coating.
8. The method adopts the electric arc spraying method to prepare the ZnAlTiSiB anticorrosive coating, the spraying material is common, the cost is low, and the electric arc spraying method has mature process, is easy to realize and is suitable for popularization.
The technical solution of the present invention is further described in detail by examples below.
Detailed Description
Example 1
The ZnAlTiSiB anticorrosive coating for the steel structure of the embodiment comprises the following components in percentage by mass: 75% of Zn, 15% of Al, 5% of Ti, 3% of Si and 2% of B.
The preparation method of the ZnAlTiSiB anticorrosive coating for the steel structure comprises the following steps:
step one, pretreating the surface of a steel structure to Sa2.5 level by adopting a high-pressure water sand blasting method;
step two, heating the ZnAlTiSiB wire to a molten state by adopting an electric arc spraying method, and spraying the ZnAlTiSiB wire to the surface of the pretreated steel structure under the action of compressed air to form a ZnAlTiSiB anticorrosive coating; the distance between a spray gun and the surface of a steel structure in the electric arc spraying method is 280mm, the spraying angle of the spray gun is 60 degrees, the electric arc voltage is 40V, the electric arc current is 600A, the conveying speed of the ZnAlTiSiB wire is 5m/min, and the pressure of compressed air is 0.9 MPa; the thickness of the ZnAlTiSiB anticorrosive coating is 110 mu m.
Through detection, the density of the ZnAlTiSiB anticorrosive coating prepared by the embodiment is 99.83%, and the microhardness is 43HV0.5The interface bonding strength of the ZnAlTiSiB anticorrosive coating and the steel structure is 32MPa, which shows that the ZnAlTiSiB anticorrosive coating prepared by the embodiment has less pores and higher hardness, and the ZnAlTiSiB anticorrosive coating is tightly bonded with the steel structure.
The ZnAlTiSiB anticorrosive coating prepared in the embodiment is detected according to GB/T10125-1997 salt spray test for artificial atmosphere corrosion test, and the result shows that the salt spray resistance time of the ZnAlTiSiB anticorrosive coating prepared in the embodiment is 1200h, which indicates that the ZnAlTiSiB anticorrosive coating prepared in the embodiment has better corrosion resistance.
Example 2
The ZnAlTiSiB anticorrosive coating for the steel structure of the embodiment comprises the following components in percentage by mass: 42.8% of Zn, 55% of Al, 0.5% of Ti, 0.7% of Si and 1% of B.
The preparation method of the ZnAlTiSiB anticorrosive coating for the steel structure comprises the following steps:
firstly, preprocessing the surface of a steel structure to Sa2.5 grade by adopting a sand blasting method;
step two, heating a ZnAlTiSiB powder core wire material consisting of ZnAl wire coated AlTiSiB powder to a molten state by adopting an electric arc spraying method, and spraying the ZnAlTiSiB powder core wire material on the surface of the steel structure pretreated in the step under the action of compressed air to form a ZnAlTiSiB anticorrosive coating; the distance between a spray gun and the surface of a steel structure in the electric arc spraying method is 100mm, the spraying angle of the spray gun is 90 degrees, the electric arc voltage is 20V, the electric arc current is 200A, the conveying speed of the ZnAlTiSiB powder core wire is 0.5m/min, and the pressure of compressed air is 0.4 MPa; the thickness of the ZnAlTiSiB anticorrosive coating is 112 mu m.
Through detection, the density of the ZnAlTiSiB anticorrosive coating prepared by the embodiment is 99.85%, and the microhardness is 42.6HV0.5Interface junction of ZnAlTiSiB anticorrosive coating and steel structureThe bonding strength is 30.5MPa, which shows that the ZnAlTiSiB anticorrosive coating prepared by the embodiment has less pores and higher hardness, and the ZnAlTiSiB anticorrosive coating is tightly combined with a steel structure.
The ZnAlTiSiB anticorrosive coating prepared in the embodiment is detected according to GB/T10125-1997 salt spray test for artificial atmosphere corrosion test, and the result shows that the salt spray resistance time of the ZnAlTiSiB anticorrosive coating prepared in the embodiment is 1200h, which indicates that the ZnAlTiSiB anticorrosive coating prepared in the embodiment has better corrosion resistance.
Example 3
The ZnAlTiSiB anticorrosive coating for the steel structure of the embodiment comprises the following components in percentage by mass: 56% of Zn, 37.7% of Al, 3% of Ti, 1.8% of Si and 1.5% of B.
The preparation method of the ZnAlTiSiB anticorrosive coating for the steel structure comprises the following steps:
step one, pretreating the surface of a steel structure to Sa2.5 level by adopting a high-pressure water sand blasting method;
step two, heating a ZnAlTiSiB powder core wire material consisting of Zn wires and Al wire coated TiSiB powder to a molten state by adopting an electric arc spraying method, and spraying the ZnAlTiSiB powder core wire material on the surface of the steel structure pretreated in the step under the action of compressed air to form a ZnAlTiSiB anticorrosive coating; the distance between a spray gun and the surface of a steel structure in the electric arc spraying method is 100mm, the spraying angle of the spray gun is 75 degrees, the electric arc voltage is 30V, the electric arc current is 400A, the conveying speed of the ZnAlTiSiB powder core wire is 2.8m/min, and the pressure of compressed air is 0.7 MPa; the thickness of the ZnAlTiSiB anticorrosive coating is 114 mu m.
Through detection, the density of the ZnAlTiSiB anticorrosive coating prepared by the embodiment is 99.82%, and the microhardness is 42.7HV0.5The interface bonding strength of the ZnAlTiSiB anticorrosive coating and the steel structure is 31.5MPa, which shows that the ZnAlTiSiB anticorrosive coating prepared by the embodiment has less pores and higher hardness, and the ZnAlTiSiB anticorrosive coating and the steel structure are tightly bonded.
The ZnAlTiSiB anticorrosive coating prepared in the embodiment is detected according to GB/T10125-1997 salt spray test for artificial atmosphere corrosion test, and the result shows that the salt spray resistance time of the ZnAlTiSiB anticorrosive coating prepared in the embodiment is 1200h, which indicates that the ZnAlTiSiB anticorrosive coating prepared in the embodiment has better corrosion resistance.
Example 4
The ZnAlTiSiB anticorrosive coating for the steel structure of the embodiment comprises the following components in percentage by mass: 60% of Zn, 34% of Al, 2.7% of Ti, 1.8% of Si and 1.5% of B.
The preparation method of the ZnAlTiSiB anticorrosive coating for the steel structure comprises the following steps:
step one, pretreating the surface of a steel structure to Sa3 level by adopting a sand blasting method;
heating Zn wires and AlTiSiB wires to a molten state by adopting an electric arc spraying method, and spraying the Zn wires and the AlTiSiB wires to the surface of the pretreated steel structure under the action of compressed air to form a ZnAlTiSiB anticorrosive coating; the distance between a spray gun and the surface of a steel structure in the electric arc spraying method is 190mm, the spraying angle of the spray gun is 60 degrees, the electric arc voltage is 40V, the electric arc current is 450A, the conveying speeds of the Zn wire and the AlTiSiB wire are 4m/min, and the pressure of compressed air is 0.6 MPa; the thickness of the ZnAlTiSiB anticorrosive coating is 113 mu m.
Through detection, the density of the ZnAlTiSiB anticorrosive coating prepared by the embodiment is 99.87%, and the microhardness is 43.2HV0.5The interface bonding strength of the ZnAlTiSiB anticorrosive coating and the steel structure is 31.2MPa, which shows that the ZnAlTiSiB anticorrosive coating prepared by the embodiment has less pores and higher hardness, and the ZnAlTiSiB anticorrosive coating and the steel structure are tightly bonded.
The ZnAlTiSiB anticorrosive coating prepared in the embodiment is detected according to GB/T10125-1997 salt spray test for artificial atmosphere corrosion test, and the result shows that the salt spray resistance time of the ZnAlTiSiB anticorrosive coating prepared in the embodiment is 1200h, which indicates that the ZnAlTiSiB anticorrosive coating prepared in the embodiment has better corrosion resistance.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modification, change and equivalent changes of the above embodiments according to the technical essence of the invention are still within the protection scope of the technical solution of the invention.
Claims (5)
1. The ZnAlTiSiB anticorrosive coating for the steel structure is characterized by comprising the following components in percentage by mass: 42.8-75% of Zn, 78-55% of Al15, 0.5-5% of Ti0.7-3% of Si and 1-2% of B.
2. A method of producing a ZnAlTiSiB anticorrosive coating for steel structures according to claim 1, characterized in that it comprises the following steps:
firstly, preprocessing the surface of a steel structure to be more than Sa2.5 grade by adopting a sand blasting method;
heating the spraying material to a molten state by adopting an electric arc spraying method, and spraying the spraying material on the surface of the pretreated steel structure under the action of compressed air to form a ZnAlTiSiB anticorrosive coating; the spraying material is a ZnAlTiSiB wire material, or a Zn wire and an AlTiSiB wire material, or a ZnAlTiSiB powder core wire material.
3. The method of claim 2, wherein in step two the ZnAlTiSiB powder core wire is composed of Zn wire and Al wire coated TiSiB powder, or ZnAl wire coated AlTiSiB powder.
4. The method according to claim 2, wherein in the second step, the distance between a spray gun and the surface of the steel structure is 100 mm-280 mm, the spraying angle of the spray gun is 60-90 degrees, the arc voltage is 20-40V, the arc current is 200A-600A, the conveying speed of the spraying material is 0.5-5 m/min, and the pressure of the compressed air is 0.4-0.9 MPa.
5. The method of claim 2, wherein the blasting in step one is high pressure water blasting.
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| CN106282694A (en) * | 2016-09-20 | 2017-01-04 | 池州市安安精工铝业有限公司 | A kind of high-strength abrasion-proof aluminium alloy extrusions and preparation method thereof |
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| JP3737987B2 (en) * | 2001-04-09 | 2006-01-25 | 新日本製鐵株式会社 | Hot-dip galvanized steel wire with high corrosion resistance and excellent workability |
| JP2004315848A (en) * | 2003-02-27 | 2004-11-11 | Nisshin Steel Co Ltd | HOT-DIP Zn-Al-Mg COATED STEEL SHEET FREE FROM WELDING CRACK DUE TO LIQUID METAL EMBRITTLEMENT |
| CN101457320A (en) * | 2009-01-04 | 2009-06-17 | 上海大学 | Al-Zn-Mg-Si alloy for hot dipping steel |
| KR20190026057A (en) * | 2010-01-06 | 2019-03-12 | 블루스코프 스틸 리미티드 | Metal coated steel strip |
| CN103373033B (en) * | 2012-04-17 | 2016-03-30 | 新兴铸管股份有限公司 | Zn-Al-Mg-RE pseudo alloy coating and preparation method thereof |
| PL2954086T3 (en) * | 2013-02-06 | 2017-07-31 | Arcelormittal | Metal sheet with a znalmg coating having a particular microstructure, and corresponding production method |
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